Flt Duty Xls. For Mac
I have many variables for the CG Calculation from aircraft.cfg and the calculated Total Weight and Total Arm for the B737-800 (FSX default).
Now the question is, what is the fsx ( or AirWrench ) internal formula for the CG % MAC value? I have tried a lot of formula find via Google. But I never have the same resulat as FSX or AirWrench ( B737-800 with EmptyWeight 35.95 % CG MAC).
Also I have try this formula in the AVSIM Documentation 'fs_flight_dynamics_v1.0' , but not with the same result as FSX or AirWrench.
As I understood in the 'flight dynamic document' is the challange to get the LEMAC ( leading edge MAC ). The basic formula for the CG % is:
Distance to CG - Distance to LEMAC = Distance CG to LEMAC
and
(Distance CG to LEMAC / MAC) * 100 = CG % MAC
For Example Default B737-800, variables given:
wing_span = 117.42 ft
wing_sweep = 27.2°
wing_root_chord = 21.0 ft
wing_area = 1344.0 ft
MAC 14.10 ft ( calculated, same result as AirWrench )
The Calculation:
OK 14,41 ft LEMAC, then I will calculate the CG % MAC from empty weight of the B737-800
Arm = 9 ft
Then the formula for CG% MAC: 9 ft - 14,41 ft = -5,41 ft
And: (-5,41 ft / 14,10 ft) * 100
= -38,64 CG % MAC
This result is not the same as FSX and AirWrench empty weight CG ( 35.95 % ).
Can anyone see the mistake in the calculation ? Thanks in advance for your help !
Best regards
Sebastian
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